Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6.git] / drivers / isdn / mISDN / dsp_core.c
1 /*
2  * Author       Andreas Eversberg (jolly@eversberg.eu)
3  * Based on source code structure by
4  *              Karsten Keil (keil@isdn4linux.de)
5  *
6  *              This file is (c) under GNU PUBLIC LICENSE
7  *              For changes and modifications please read
8  *              ../../../Documentation/isdn/mISDN.cert
9  *
10  * Thanks to    Karsten Keil (great drivers)
11  *              Cologne Chip (great chips)
12  *
13  * This module does:
14  *              Real-time tone generation
15  *              DTMF detection
16  *              Real-time cross-connection and conferrence
17  *              Compensate jitter due to system load and hardware fault.
18  *              All features are done in kernel space and will be realized
19  *              using hardware, if available and supported by chip set.
20  *              Blowfish encryption/decryption
21  */
22
23 /* STRUCTURE:
24  *
25  * The dsp module provides layer 2 for b-channels (64kbit). It provides
26  * transparent audio forwarding with special digital signal processing:
27  *
28  * - (1) generation of tones
29  * - (2) detection of dtmf tones
30  * - (3) crossconnecting and conferences (clocking)
31  * - (4) echo generation for delay test
32  * - (5) volume control
33  * - (6) disable receive data
34  * - (7) pipeline
35  * - (8) encryption/decryption
36  *
37  * Look:
38  *             TX            RX
39  *         ------upper layer------
40  *             |             ^
41  *             |             |(6)
42  *             v             |
43  *       +-----+-------------+-----+
44  *       |(3)(4)                   |
45  *       |           CMX           |
46  *       |                         |
47  *       |           +-------------+
48  *       |           |       ^
49  *       |           |       |
50  *       |+---------+|  +----+----+
51  *       ||(1)      ||  |(2)      |
52  *       ||         ||  |         |
53  *       ||  Tones  ||  |  DTMF   |
54  *       ||         ||  |         |
55  *       ||         ||  |         |
56  *       |+----+----+|  +----+----+
57  *       +-----+-----+       ^
58  *             |             |
59  *             v             |
60  *        +----+----+   +----+----+
61  *        |(5)      |   |(5)      |
62  *        |         |   |         |
63  *        |TX Volume|   |RX Volume|
64  *        |         |   |         |
65  *        |         |   |         |
66  *        +----+----+   +----+----+
67  *             |             ^
68  *             |             |
69  *             v             |
70  *        +----+-------------+----+
71  *        |(7)                    |
72  *        |                       |
73  *        |  Pipeline Processing  |
74  *        |                       |
75  *        |                       |
76  *        +----+-------------+----+
77  *             |             ^
78  *             |             |
79  *             v             |
80  *        +----+----+   +----+----+
81  *        |(8)      |   |(8)      |
82  *        |         |   |         |
83  *        | Encrypt |   | Decrypt |
84  *        |         |   |         |
85  *        |         |   |         |
86  *        +----+----+   +----+----+
87  *             |             ^
88  *             |             |
89  *             v             |
90  *         ------card  layer------
91  *             TX            RX
92  *
93  * Above you can see the logical data flow. If software is used to do the
94  * process, it is actually the real data flow. If hardware is used, data
95  * may not flow, but hardware commands to the card, to provide the data flow
96  * as shown.
97  *
98  * NOTE: The channel must be activated in order to make dsp work, even if
99  * no data flow to the upper layer is intended. Activation can be done
100  * after and before controlling the setting using PH_CONTROL requests.
101  *
102  * DTMF: Will be detected by hardware if possible. It is done before CMX
103  * processing.
104  *
105  * Tones: Will be generated via software if endless looped audio fifos are
106  * not supported by hardware. Tones will override all data from CMX.
107  * It is not required to join a conference to use tones at any time.
108  *
109  * CMX: Is transparent when not used. When it is used, it will do
110  * crossconnections and conferences via software if not possible through
111  * hardware. If hardware capability is available, hardware is used.
112  *
113  * Echo: Is generated by CMX and is used to check performane of hard and
114  * software CMX.
115  *
116  * The CMX has special functions for conferences with one, two and more
117  * members. It will allow different types of data flow. Receive and transmit
118  * data to/form upper layer may be swithed on/off individually without loosing
119  * features of CMX, Tones and DTMF.
120  *
121  * Echo Cancellation: Sometimes we like to cancel echo from the interface.
122  * Note that a VoIP call may not have echo caused by the IP phone. The echo
123  * is generated by the telephone line connected to it. Because the delay
124  * is high, it becomes an echo. RESULT: Echo Cachelation is required if
125  * both echo AND delay is applied to an interface.
126  * Remember that software CMX always generates a more or less delay.
127  *
128  * If all used features can be realized in hardware, and if transmit and/or
129  * receive data ist disabled, the card may not send/receive any data at all.
130  * Not receiving is usefull if only announcements are played. Not sending is
131  * usefull if an answering machine records audio. Not sending and receiving is
132  * usefull during most states of the call. If supported by hardware, tones
133  * will be played without cpu load. Small PBXs and NT-Mode applications will
134  * not need expensive hardware when processing calls.
135  *
136  *
137  * LOCKING:
138  *
139  * When data is received from upper or lower layer (card), the complete dsp
140  * module is locked by a global lock.  This lock MUST lock irq, because it
141  * must lock timer events by DSP poll timer.
142  * When data is ready to be transmitted down, the data is queued and sent
143  * outside lock and timer event.
144  * PH_CONTROL must not change any settings, join or split conference members
145  * during process of data.
146  *
147  * HDLC:
148  *
149  * It works quite the same as transparent, except that HDLC data is forwarded
150  * to all other conference members if no hardware bridging is possible.
151  * Send data will be writte to sendq. Sendq will be sent if confirm is received.
152  * Conference cannot join, if one member is not hdlc.
153  *
154  */
155
156 #include <linux/delay.h>
157 #include <linux/mISDNif.h>
158 #include <linux/mISDNdsp.h>
159 #include <linux/module.h>
160 #include <linux/vmalloc.h>
161 #include "core.h"
162 #include "dsp.h"
163
164 static const char *mISDN_dsp_revision = "2.0";
165
166 static int debug;
167 static int options;
168 static int poll;
169 static int dtmfthreshold = 100;
170
171 MODULE_AUTHOR("Andreas Eversberg");
172 module_param(debug, uint, S_IRUGO | S_IWUSR);
173 module_param(options, uint, S_IRUGO | S_IWUSR);
174 module_param(poll, uint, S_IRUGO | S_IWUSR);
175 module_param(dtmfthreshold, uint, S_IRUGO | S_IWUSR);
176 MODULE_LICENSE("GPL");
177
178 /*int spinnest = 0;*/
179
180 spinlock_t dsp_lock; /* global dsp lock */
181 struct list_head dsp_ilist;
182 struct list_head conf_ilist;
183 int dsp_debug;
184 int dsp_options;
185 int dsp_poll, dsp_tics;
186
187 /* check if rx may be turned off or must be turned on */
188 static void
189 dsp_rx_off_member(struct dsp *dsp)
190 {
191         struct mISDN_ctrl_req   cq;
192         int rx_off = 1;
193
194         memset(&cq, 0, sizeof(cq));
195
196         if (!dsp->features_rx_off)
197                 return;
198
199         /* not disabled */
200         if (!dsp->rx_disabled)
201                 rx_off = 0;
202         /* software dtmf */
203         else if (dsp->dtmf.software)
204                 rx_off = 0;
205         /* echo in software */
206         else if (dsp->echo.software)
207                 rx_off = 0;
208         /* bridge in software */
209         else if (dsp->conf && dsp->conf->software)
210                 rx_off = 0;
211         /* data is not required by user space and not required
212          * for echo dtmf detection, soft-echo, soft-bridging */
213
214         if (rx_off == dsp->rx_is_off)
215                 return;
216
217         if (!dsp->ch.peer) {
218                 if (dsp_debug & DEBUG_DSP_CORE)
219                         printk(KERN_DEBUG "%s: no peer, no rx_off\n",
220                                 __func__);
221                 return;
222         }
223         cq.op = MISDN_CTRL_RX_OFF;
224         cq.p1 = rx_off;
225         if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
226                 printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
227                         __func__);
228                 return;
229         }
230         dsp->rx_is_off = rx_off;
231         if (dsp_debug & DEBUG_DSP_CORE)
232                 printk(KERN_DEBUG "%s: %s set rx_off = %d\n",
233                         __func__, dsp->name, rx_off);
234 }
235 static void
236 dsp_rx_off(struct dsp *dsp)
237 {
238         struct dsp_conf_member  *member;
239
240         if (dsp_options & DSP_OPT_NOHARDWARE)
241                 return;
242
243         /* no conf */
244         if (!dsp->conf) {
245                 dsp_rx_off_member(dsp);
246                 return;
247         }
248         /* check all members in conf */
249         list_for_each_entry(member, &dsp->conf->mlist, list) {
250                 dsp_rx_off_member(member->dsp);
251         }
252 }
253
254 /* enable "fill empty" feature */
255 static void
256 dsp_fill_empty(struct dsp *dsp)
257 {
258         struct mISDN_ctrl_req   cq;
259
260         memset(&cq, 0, sizeof(cq));
261
262         if (!dsp->ch.peer) {
263                 if (dsp_debug & DEBUG_DSP_CORE)
264                         printk(KERN_DEBUG "%s: no peer, no fill_empty\n",
265                                 __func__);
266                 return;
267         }
268         cq.op = MISDN_CTRL_FILL_EMPTY;
269         cq.p1 = 1;
270         if (dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq)) {
271                 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
272                         __func__);
273                 return;
274         }
275         if (dsp_debug & DEBUG_DSP_CORE)
276                 printk(KERN_DEBUG "%s: %s set fill_empty = 1\n",
277                         __func__, dsp->name);
278 }
279
280 static int
281 dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb)
282 {
283         struct sk_buff  *nskb;
284         int ret = 0;
285         int cont;
286         u8 *data;
287         int len;
288
289         if (skb->len < sizeof(int))
290                 printk(KERN_ERR "%s: PH_CONTROL message too short\n", __func__);
291         cont = *((int *)skb->data);
292         len = skb->len - sizeof(int);
293         data = skb->data + sizeof(int);
294
295         switch (cont) {
296         case DTMF_TONE_START: /* turn on DTMF */
297                 if (dsp->hdlc) {
298                         ret = -EINVAL;
299                         break;
300                 }
301                 if (dsp_debug & DEBUG_DSP_CORE)
302                         printk(KERN_DEBUG "%s: start dtmf\n", __func__);
303                 if (len == sizeof(int)) {
304                         if (dsp_debug & DEBUG_DSP_CORE)
305                                 printk(KERN_NOTICE "changing DTMF Threshold "
306                                         "to %d\n", *((int *)data));
307                         dsp->dtmf.treshold = (*(int *)data) * 10000;
308                 }
309                 dsp->dtmf.enable = 1;
310                 /* init goertzel */
311                 dsp_dtmf_goertzel_init(dsp);
312
313                 /* check dtmf hardware */
314                 dsp_dtmf_hardware(dsp);
315                 dsp_rx_off(dsp);
316                 break;
317         case DTMF_TONE_STOP: /* turn off DTMF */
318                 if (dsp_debug & DEBUG_DSP_CORE)
319                         printk(KERN_DEBUG "%s: stop dtmf\n", __func__);
320                 dsp->dtmf.enable = 0;
321                 dsp->dtmf.hardware = 0;
322                 dsp->dtmf.software = 0;
323                 break;
324         case DSP_CONF_JOIN: /* join / update conference */
325                 if (len < sizeof(int)) {
326                         ret = -EINVAL;
327                         break;
328                 }
329                 if (*((u32 *)data) == 0)
330                         goto conf_split;
331                 if (dsp_debug & DEBUG_DSP_CORE)
332                         printk(KERN_DEBUG "%s: join conference %d\n",
333                                 __func__, *((u32 *)data));
334                 ret = dsp_cmx_conf(dsp, *((u32 *)data));
335                         /* dsp_cmx_hardware will also be called here */
336                 dsp_rx_off(dsp);
337                 if (dsp_debug & DEBUG_DSP_CMX)
338                         dsp_cmx_debug(dsp);
339                 break;
340         case DSP_CONF_SPLIT: /* remove from conference */
341 conf_split:
342                 if (dsp_debug & DEBUG_DSP_CORE)
343                         printk(KERN_DEBUG "%s: release conference\n", __func__);
344                 ret = dsp_cmx_conf(dsp, 0);
345                         /* dsp_cmx_hardware will also be called here */
346                 if (dsp_debug & DEBUG_DSP_CMX)
347                         dsp_cmx_debug(dsp);
348                 dsp_rx_off(dsp);
349                 break;
350         case DSP_TONE_PATT_ON: /* play tone */
351                 if (dsp->hdlc) {
352                         ret = -EINVAL;
353                         break;
354                 }
355                 if (len < sizeof(int)) {
356                         ret = -EINVAL;
357                         break;
358                 }
359                 if (dsp_debug & DEBUG_DSP_CORE)
360                         printk(KERN_DEBUG "%s: turn tone 0x%x on\n",
361                                 __func__, *((int *)skb->data));
362                 ret = dsp_tone(dsp, *((int *)data));
363                 if (!ret) {
364                         dsp_cmx_hardware(dsp->conf, dsp);
365                         dsp_rx_off(dsp);
366                 }
367                 if (!dsp->tone.tone)
368                         goto tone_off;
369                 break;
370         case DSP_TONE_PATT_OFF: /* stop tone */
371                 if (dsp->hdlc) {
372                         ret = -EINVAL;
373                         break;
374                 }
375                 if (dsp_debug & DEBUG_DSP_CORE)
376                         printk(KERN_DEBUG "%s: turn tone off\n", __func__);
377                 dsp_tone(dsp, 0);
378                 dsp_cmx_hardware(dsp->conf, dsp);
379                 dsp_rx_off(dsp);
380                 /* reset tx buffers (user space data) */
381 tone_off:
382                 dsp->rx_W = 0;
383                 dsp->rx_R = 0;
384                 break;
385         case DSP_VOL_CHANGE_TX: /* change volume */
386                 if (dsp->hdlc) {
387                         ret = -EINVAL;
388                         break;
389                 }
390                 if (len < sizeof(int)) {
391                         ret = -EINVAL;
392                         break;
393                 }
394                 dsp->tx_volume = *((int *)data);
395                 if (dsp_debug & DEBUG_DSP_CORE)
396                         printk(KERN_DEBUG "%s: change tx vol to %d\n",
397                                 __func__, dsp->tx_volume);
398                 dsp_cmx_hardware(dsp->conf, dsp);
399                 dsp_dtmf_hardware(dsp);
400                 dsp_rx_off(dsp);
401                 break;
402         case DSP_VOL_CHANGE_RX: /* change volume */
403                 if (dsp->hdlc) {
404                         ret = -EINVAL;
405                         break;
406                 }
407                 if (len < sizeof(int)) {
408                         ret = -EINVAL;
409                         break;
410                 }
411                 dsp->rx_volume = *((int *)data);
412                 if (dsp_debug & DEBUG_DSP_CORE)
413                         printk(KERN_DEBUG "%s: change rx vol to %d\n",
414                                 __func__, dsp->tx_volume);
415                 dsp_cmx_hardware(dsp->conf, dsp);
416                 dsp_dtmf_hardware(dsp);
417                 dsp_rx_off(dsp);
418                 break;
419         case DSP_ECHO_ON: /* enable echo */
420                 dsp->echo.software = 1; /* soft echo */
421                 if (dsp_debug & DEBUG_DSP_CORE)
422                         printk(KERN_DEBUG "%s: enable cmx-echo\n", __func__);
423                 dsp_cmx_hardware(dsp->conf, dsp);
424                 dsp_rx_off(dsp);
425                 if (dsp_debug & DEBUG_DSP_CMX)
426                         dsp_cmx_debug(dsp);
427                 break;
428         case DSP_ECHO_OFF: /* disable echo */
429                 dsp->echo.software = 0;
430                 dsp->echo.hardware = 0;
431                 if (dsp_debug & DEBUG_DSP_CORE)
432                         printk(KERN_DEBUG "%s: disable cmx-echo\n", __func__);
433                 dsp_cmx_hardware(dsp->conf, dsp);
434                 dsp_rx_off(dsp);
435                 if (dsp_debug & DEBUG_DSP_CMX)
436                         dsp_cmx_debug(dsp);
437                 break;
438         case DSP_RECEIVE_ON: /* enable receive to user space */
439                 if (dsp_debug & DEBUG_DSP_CORE)
440                         printk(KERN_DEBUG "%s: enable receive to user "
441                                 "space\n", __func__);
442                 dsp->rx_disabled = 0;
443                 dsp_rx_off(dsp);
444                 break;
445         case DSP_RECEIVE_OFF: /* disable receive to user space */
446                 if (dsp_debug & DEBUG_DSP_CORE)
447                         printk(KERN_DEBUG "%s: disable receive to "
448                                 "user space\n", __func__);
449                 dsp->rx_disabled = 1;
450                 dsp_rx_off(dsp);
451                 break;
452         case DSP_MIX_ON: /* enable mixing of tx data */
453                 if (dsp->hdlc) {
454                         ret = -EINVAL;
455                         break;
456                 }
457                 if (dsp_debug & DEBUG_DSP_CORE)
458                         printk(KERN_DEBUG "%s: enable mixing of "
459                                 "tx-data with conf mebers\n", __func__);
460                 dsp->tx_mix = 1;
461                 dsp_cmx_hardware(dsp->conf, dsp);
462                 dsp_rx_off(dsp);
463                 if (dsp_debug & DEBUG_DSP_CMX)
464                         dsp_cmx_debug(dsp);
465                 break;
466         case DSP_MIX_OFF: /* disable mixing of tx data */
467                 if (dsp->hdlc) {
468                         ret = -EINVAL;
469                         break;
470                 }
471                 if (dsp_debug & DEBUG_DSP_CORE)
472                         printk(KERN_DEBUG "%s: disable mixing of "
473                                 "tx-data with conf mebers\n", __func__);
474                 dsp->tx_mix = 0;
475                 dsp_cmx_hardware(dsp->conf, dsp);
476                 dsp_rx_off(dsp);
477                 if (dsp_debug & DEBUG_DSP_CMX)
478                         dsp_cmx_debug(dsp);
479                 break;
480         case DSP_TXDATA_ON: /* enable txdata */
481                 dsp->tx_data = 1;
482                 if (dsp_debug & DEBUG_DSP_CORE)
483                         printk(KERN_DEBUG "%s: enable tx-data\n", __func__);
484                 dsp_cmx_hardware(dsp->conf, dsp);
485                 dsp_rx_off(dsp);
486                 if (dsp_debug & DEBUG_DSP_CMX)
487                         dsp_cmx_debug(dsp);
488                 break;
489         case DSP_TXDATA_OFF: /* disable txdata */
490                 dsp->tx_data = 0;
491                 if (dsp_debug & DEBUG_DSP_CORE)
492                         printk(KERN_DEBUG "%s: disable tx-data\n", __func__);
493                 dsp_cmx_hardware(dsp->conf, dsp);
494                 dsp_rx_off(dsp);
495                 if (dsp_debug & DEBUG_DSP_CMX)
496                         dsp_cmx_debug(dsp);
497                 break;
498         case DSP_DELAY: /* use delay algorithm instead of dynamic
499                            jitter algorithm */
500                 if (dsp->hdlc) {
501                         ret = -EINVAL;
502                         break;
503                 }
504                 if (len < sizeof(int)) {
505                         ret = -EINVAL;
506                         break;
507                 }
508                 dsp->cmx_delay = (*((int *)data)) << 3;
509                         /* milliseconds to samples */
510                 if (dsp->cmx_delay >= (CMX_BUFF_HALF>>1))
511                         /* clip to half of maximum usable buffer
512                         (half of half buffer) */
513                         dsp->cmx_delay = (CMX_BUFF_HALF>>1) - 1;
514                 if (dsp_debug & DEBUG_DSP_CORE)
515                         printk(KERN_DEBUG "%s: use delay algorithm to "
516                                 "compensate jitter (%d samples)\n",
517                                 __func__, dsp->cmx_delay);
518                 break;
519         case DSP_JITTER: /* use dynamic jitter algorithm instead of
520                     delay algorithm */
521                 if (dsp->hdlc) {
522                         ret = -EINVAL;
523                         break;
524                 }
525                 dsp->cmx_delay = 0;
526                 if (dsp_debug & DEBUG_DSP_CORE)
527                         printk(KERN_DEBUG "%s: use jitter algorithm to "
528                                 "compensate jitter\n", __func__);
529                 break;
530         case DSP_TX_DEJITTER: /* use dynamic jitter algorithm for tx-buffer */
531                 if (dsp->hdlc) {
532                         ret = -EINVAL;
533                         break;
534                 }
535                 dsp->tx_dejitter = 1;
536                 if (dsp_debug & DEBUG_DSP_CORE)
537                         printk(KERN_DEBUG "%s: use dejitter on TX "
538                                 "buffer\n", __func__);
539                 break;
540         case DSP_TX_DEJ_OFF: /* use tx-buffer without dejittering*/
541                 if (dsp->hdlc) {
542                         ret = -EINVAL;
543                         break;
544                 }
545                 dsp->tx_dejitter = 0;
546                 if (dsp_debug & DEBUG_DSP_CORE)
547                         printk(KERN_DEBUG "%s: use TX buffer without "
548                                 "dejittering\n", __func__);
549                 break;
550         case DSP_PIPELINE_CFG:
551                 if (dsp->hdlc) {
552                         ret = -EINVAL;
553                         break;
554                 }
555                 if (len > 0 && ((char *)data)[len - 1]) {
556                         printk(KERN_DEBUG "%s: pipeline config string "
557                                 "is not NULL terminated!\n", __func__);
558                         ret = -EINVAL;
559                 } else {
560                         dsp->pipeline.inuse = 1;
561                         dsp_cmx_hardware(dsp->conf, dsp);
562                         ret = dsp_pipeline_build(&dsp->pipeline,
563                                 len > 0 ? data : NULL);
564                         dsp_cmx_hardware(dsp->conf, dsp);
565                         dsp_rx_off(dsp);
566                 }
567                 break;
568         case DSP_BF_ENABLE_KEY: /* turn blowfish on */
569                 if (dsp->hdlc) {
570                         ret = -EINVAL;
571                         break;
572                 }
573                 if (len < 4 || len > 56) {
574                         ret = -EINVAL;
575                         break;
576                 }
577                 if (dsp_debug & DEBUG_DSP_CORE)
578                         printk(KERN_DEBUG "%s: turn blowfish on (key "
579                                 "not shown)\n", __func__);
580                 ret = dsp_bf_init(dsp, (u8 *)data, len);
581                 /* set new cont */
582                 if (!ret)
583                         cont = DSP_BF_ACCEPT;
584                 else
585                         cont = DSP_BF_REJECT;
586                 /* send indication if it worked to set it */
587                 nskb = _alloc_mISDN_skb(PH_CONTROL_IND, MISDN_ID_ANY,
588                         sizeof(int), &cont, GFP_ATOMIC);
589                 if (nskb) {
590                         if (dsp->up) {
591                                 if (dsp->up->send(dsp->up, nskb))
592                                         dev_kfree_skb(nskb);
593                         } else
594                                 dev_kfree_skb(nskb);
595                 }
596                 if (!ret) {
597                         dsp_cmx_hardware(dsp->conf, dsp);
598                         dsp_dtmf_hardware(dsp);
599                         dsp_rx_off(dsp);
600                 }
601                 break;
602         case DSP_BF_DISABLE: /* turn blowfish off */
603                 if (dsp->hdlc) {
604                         ret = -EINVAL;
605                         break;
606                 }
607                 if (dsp_debug & DEBUG_DSP_CORE)
608                         printk(KERN_DEBUG "%s: turn blowfish off\n", __func__);
609                 dsp_bf_cleanup(dsp);
610                 dsp_cmx_hardware(dsp->conf, dsp);
611                 dsp_dtmf_hardware(dsp);
612                 dsp_rx_off(dsp);
613                 break;
614         default:
615                 if (dsp_debug & DEBUG_DSP_CORE)
616                         printk(KERN_DEBUG "%s: ctrl req %x unhandled\n",
617                                 __func__, cont);
618                 ret = -EINVAL;
619         }
620         return ret;
621 }
622
623 static void
624 get_features(struct mISDNchannel *ch)
625 {
626         struct dsp              *dsp = container_of(ch, struct dsp, ch);
627         struct mISDN_ctrl_req   cq;
628
629         if (!ch->peer) {
630                 if (dsp_debug & DEBUG_DSP_CORE)
631                         printk(KERN_DEBUG "%s: no peer, no features\n",
632                                 __func__);
633                 return;
634         }
635         memset(&cq, 0, sizeof(cq));
636         cq.op = MISDN_CTRL_GETOP;
637         if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq) < 0) {
638                 printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
639                         __func__);
640                 return;
641         }
642         if (cq.op & MISDN_CTRL_RX_OFF)
643                 dsp->features_rx_off = 1;
644         if (cq.op & MISDN_CTRL_FILL_EMPTY)
645                 dsp->features_fill_empty = 1;
646         if (dsp_options & DSP_OPT_NOHARDWARE)
647                 return;
648         if ((cq.op & MISDN_CTRL_HW_FEATURES_OP)) {
649                 cq.op = MISDN_CTRL_HW_FEATURES;
650                 *((u_long *)&cq.p1) = (u_long)&dsp->features;
651                 if (ch->peer->ctrl(ch->peer, CONTROL_CHANNEL, &cq)) {
652                         printk(KERN_DEBUG "%s: 2nd CONTROL_CHANNEL failed\n",
653                                 __func__);
654                 }
655         } else
656                 if (dsp_debug & DEBUG_DSP_CORE)
657                         printk(KERN_DEBUG "%s: features not supported for %s\n",
658                                 __func__, dsp->name);
659 }
660
661 static int
662 dsp_function(struct mISDNchannel *ch,  struct sk_buff *skb)
663 {
664         struct dsp              *dsp = container_of(ch, struct dsp, ch);
665         struct mISDNhead        *hh;
666         int                     ret = 0;
667         u8                      *digits = NULL;
668         u_long                  flags;
669
670         hh = mISDN_HEAD_P(skb);
671         switch (hh->prim) {
672         /* FROM DOWN */
673         case (PH_DATA_CNF):
674                 dsp->data_pending = 0;
675                 /* trigger next hdlc frame, if any */
676                 if (dsp->hdlc) {
677                         spin_lock_irqsave(&dsp_lock, flags);
678                         if (dsp->b_active)
679                                 schedule_work(&dsp->workq);
680                         spin_unlock_irqrestore(&dsp_lock, flags);
681                 }
682                 break;
683         case (PH_DATA_IND):
684         case (DL_DATA_IND):
685                 if (skb->len < 1) {
686                         ret = -EINVAL;
687                         break;
688                 }
689                 if (dsp->rx_is_off) {
690                         if (dsp_debug & DEBUG_DSP_CORE)
691                                 printk(KERN_DEBUG "%s: rx-data during rx_off"
692                                         " for %s\n",
693                                 __func__, dsp->name);
694                 }
695                 if (dsp->hdlc) {
696                         /* hdlc */
697                         spin_lock_irqsave(&dsp_lock, flags);
698                         dsp_cmx_hdlc(dsp, skb);
699                         spin_unlock_irqrestore(&dsp_lock, flags);
700                         if (dsp->rx_disabled) {
701                                 /* if receive is not allowed */
702                                 break;
703                         }
704                         hh->prim = DL_DATA_IND;
705                         if (dsp->up)
706                                 return dsp->up->send(dsp->up, skb);
707                         break;
708                 }
709
710                 spin_lock_irqsave(&dsp_lock, flags);
711
712                 /* decrypt if enabled */
713                 if (dsp->bf_enable)
714                         dsp_bf_decrypt(dsp, skb->data, skb->len);
715                 /* pipeline */
716                 if (dsp->pipeline.inuse)
717                         dsp_pipeline_process_rx(&dsp->pipeline, skb->data,
718                                 skb->len, hh->id);
719                 /* change volume if requested */
720                 if (dsp->rx_volume)
721                         dsp_change_volume(skb, dsp->rx_volume);
722                 /* check if dtmf soft decoding is turned on */
723                 if (dsp->dtmf.software) {
724                         digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
725                                 skb->len, (dsp_options&DSP_OPT_ULAW) ? 1 : 0);
726                 }
727                 /* we need to process receive data if software */
728                 if (dsp->conf && dsp->conf->software) {
729                         /* process data from card at cmx */
730                         dsp_cmx_receive(dsp, skb);
731                 }
732
733                 spin_unlock_irqrestore(&dsp_lock, flags);
734
735                 /* send dtmf result, if any */
736                 if (digits) {
737                         while (*digits) {
738                                 int k;
739                                 struct sk_buff *nskb;
740                                 if (dsp_debug & DEBUG_DSP_DTMF)
741                                         printk(KERN_DEBUG "%s: digit"
742                                             "(%c) to layer %s\n",
743                                             __func__, *digits, dsp->name);
744                                 k = *digits | DTMF_TONE_VAL;
745                                 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
746                                         MISDN_ID_ANY, sizeof(int), &k,
747                                         GFP_ATOMIC);
748                                 if (nskb) {
749                                         if (dsp->up) {
750                                                 if (dsp->up->send(
751                                                     dsp->up, nskb))
752                                                         dev_kfree_skb(nskb);
753                                         } else
754                                                 dev_kfree_skb(nskb);
755                                 }
756                                 digits++;
757                         }
758                 }
759                 if (dsp->rx_disabled) {
760                         /* if receive is not allowed */
761                         break;
762                 }
763                 hh->prim = DL_DATA_IND;
764                 if (dsp->up)
765                         return dsp->up->send(dsp->up, skb);
766                 break;
767         case (PH_CONTROL_IND):
768                 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
769                         printk(KERN_DEBUG "%s: PH_CONTROL INDICATION "
770                                 "received: %x (len %d) %s\n", __func__,
771                                 hh->id, skb->len, dsp->name);
772                 switch (hh->id) {
773                 case (DTMF_HFC_COEF): /* getting coefficients */
774                         if (!dsp->dtmf.hardware) {
775                                 if (dsp_debug & DEBUG_DSP_DTMFCOEFF)
776                                         printk(KERN_DEBUG "%s: ignoring DTMF "
777                                                 "coefficients from HFC\n",
778                                                 __func__);
779                                 break;
780                         }
781                         digits = dsp_dtmf_goertzel_decode(dsp, skb->data,
782                                 skb->len, 2);
783                         while (*digits) {
784                                 int k;
785                                 struct sk_buff *nskb;
786                                 if (dsp_debug & DEBUG_DSP_DTMF)
787                                         printk(KERN_DEBUG "%s: digit"
788                                             "(%c) to layer %s\n",
789                                             __func__, *digits, dsp->name);
790                                 k = *digits | DTMF_TONE_VAL;
791                                 nskb = _alloc_mISDN_skb(PH_CONTROL_IND,
792                                         MISDN_ID_ANY, sizeof(int), &k,
793                                         GFP_ATOMIC);
794                                 if (nskb) {
795                                         if (dsp->up) {
796                                                 if (dsp->up->send(
797                                                     dsp->up, nskb))
798                                                         dev_kfree_skb(nskb);
799                                         } else
800                                                 dev_kfree_skb(nskb);
801                                 }
802                                 digits++;
803                         }
804                         break;
805                 case (HFC_VOL_CHANGE_TX): /* change volume */
806                         if (skb->len != sizeof(int)) {
807                                 ret = -EINVAL;
808                                 break;
809                         }
810                         spin_lock_irqsave(&dsp_lock, flags);
811                         dsp->tx_volume = *((int *)skb->data);
812                         if (dsp_debug & DEBUG_DSP_CORE)
813                                 printk(KERN_DEBUG "%s: change tx volume to "
814                                         "%d\n", __func__, dsp->tx_volume);
815                         dsp_cmx_hardware(dsp->conf, dsp);
816                         dsp_dtmf_hardware(dsp);
817                         dsp_rx_off(dsp);
818                         spin_unlock_irqrestore(&dsp_lock, flags);
819                         break;
820                 default:
821                         if (dsp_debug & DEBUG_DSP_CORE)
822                                 printk(KERN_DEBUG "%s: ctrl ind %x unhandled "
823                                         "%s\n", __func__, hh->id, dsp->name);
824                         ret = -EINVAL;
825                 }
826                 break;
827         case (PH_ACTIVATE_IND):
828         case (PH_ACTIVATE_CNF):
829                 if (dsp_debug & DEBUG_DSP_CORE)
830                         printk(KERN_DEBUG "%s: b_channel is now active %s\n",
831                                 __func__, dsp->name);
832                 /* bchannel now active */
833                 spin_lock_irqsave(&dsp_lock, flags);
834                 dsp->b_active = 1;
835                 dsp->data_pending = 0;
836                 dsp->rx_init = 1;
837                         /* rx_W and rx_R will be adjusted on first frame */
838                 dsp->rx_W = 0;
839                 dsp->rx_R = 0;
840                 memset(dsp->rx_buff, 0, sizeof(dsp->rx_buff));
841                 dsp_cmx_hardware(dsp->conf, dsp);
842                 dsp_dtmf_hardware(dsp);
843                 dsp_rx_off(dsp);
844                 spin_unlock_irqrestore(&dsp_lock, flags);
845                 if (dsp_debug & DEBUG_DSP_CORE)
846                         printk(KERN_DEBUG "%s: done with activation, sending "
847                                 "confirm to user space. %s\n", __func__,
848                                 dsp->name);
849                 /* send activation to upper layer */
850                 hh->prim = DL_ESTABLISH_CNF;
851                 if (dsp->up)
852                         return dsp->up->send(dsp->up, skb);
853                 break;
854         case (PH_DEACTIVATE_IND):
855         case (PH_DEACTIVATE_CNF):
856                 if (dsp_debug & DEBUG_DSP_CORE)
857                         printk(KERN_DEBUG "%s: b_channel is now inactive %s\n",
858                                 __func__, dsp->name);
859                 /* bchannel now inactive */
860                 spin_lock_irqsave(&dsp_lock, flags);
861                 dsp->b_active = 0;
862                 dsp->data_pending = 0;
863                 dsp_cmx_hardware(dsp->conf, dsp);
864                 dsp_rx_off(dsp);
865                 spin_unlock_irqrestore(&dsp_lock, flags);
866                 hh->prim = DL_RELEASE_CNF;
867                 if (dsp->up)
868                         return dsp->up->send(dsp->up, skb);
869                 break;
870         /* FROM UP */
871         case (DL_DATA_REQ):
872         case (PH_DATA_REQ):
873                 if (skb->len < 1) {
874                         ret = -EINVAL;
875                         break;
876                 }
877                 if (dsp->hdlc) {
878                         /* hdlc */
879                         if (!dsp->b_active) {
880                                 ret = -EIO;
881                                 break;
882                         }
883                         hh->prim = PH_DATA_REQ;
884                         spin_lock_irqsave(&dsp_lock, flags);
885                         skb_queue_tail(&dsp->sendq, skb);
886                         schedule_work(&dsp->workq);
887                         spin_unlock_irqrestore(&dsp_lock, flags);
888                         return 0;
889                 }
890                 /* send data to tx-buffer (if no tone is played) */
891                 if (!dsp->tone.tone) {
892                         spin_lock_irqsave(&dsp_lock, flags);
893                         dsp_cmx_transmit(dsp, skb);
894                         spin_unlock_irqrestore(&dsp_lock, flags);
895                 }
896                 break;
897         case (PH_CONTROL_REQ):
898                 spin_lock_irqsave(&dsp_lock, flags);
899                 ret = dsp_control_req(dsp, hh, skb);
900                 spin_unlock_irqrestore(&dsp_lock, flags);
901                 break;
902         case (DL_ESTABLISH_REQ):
903         case (PH_ACTIVATE_REQ):
904                 if (dsp_debug & DEBUG_DSP_CORE)
905                         printk(KERN_DEBUG "%s: activating b_channel %s\n",
906                                 __func__, dsp->name);
907                 if (dsp->dtmf.hardware || dsp->dtmf.software)
908                         dsp_dtmf_goertzel_init(dsp);
909                 get_features(ch);
910                 /* enable fill_empty feature */
911                 if (dsp->features_fill_empty)
912                         dsp_fill_empty(dsp);
913                 /* send ph_activate */
914                 hh->prim = PH_ACTIVATE_REQ;
915                 if (ch->peer)
916                         return ch->recv(ch->peer, skb);
917                 break;
918         case (DL_RELEASE_REQ):
919         case (PH_DEACTIVATE_REQ):
920                 if (dsp_debug & DEBUG_DSP_CORE)
921                         printk(KERN_DEBUG "%s: releasing b_channel %s\n",
922                                 __func__, dsp->name);
923                 spin_lock_irqsave(&dsp_lock, flags);
924                 dsp->tone.tone = 0;
925                 dsp->tone.hardware = 0;
926                 dsp->tone.software = 0;
927                 if (timer_pending(&dsp->tone.tl))
928                         del_timer(&dsp->tone.tl);
929                 if (dsp->conf)
930                         dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be
931                                                  called here */
932                 skb_queue_purge(&dsp->sendq);
933                 spin_unlock_irqrestore(&dsp_lock, flags);
934                 hh->prim = PH_DEACTIVATE_REQ;
935                 if (ch->peer)
936                         return ch->recv(ch->peer, skb);
937                 break;
938         default:
939                 if (dsp_debug & DEBUG_DSP_CORE)
940                         printk(KERN_DEBUG "%s: msg %x unhandled %s\n",
941                                 __func__, hh->prim, dsp->name);
942                 ret = -EINVAL;
943         }
944         if (!ret)
945                 dev_kfree_skb(skb);
946         return ret;
947 }
948
949 static int
950 dsp_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
951 {
952         struct dsp              *dsp = container_of(ch, struct dsp, ch);
953         u_long          flags;
954         int             err = 0;
955
956         if (debug & DEBUG_DSP_CTRL)
957                 printk(KERN_DEBUG "%s:(%x)\n", __func__, cmd);
958
959         switch (cmd) {
960         case OPEN_CHANNEL:
961                 break;
962         case CLOSE_CHANNEL:
963                 if (dsp->ch.peer)
964                         dsp->ch.peer->ctrl(dsp->ch.peer, CLOSE_CHANNEL, NULL);
965
966                 /* wait until workqueue has finished,
967                  * must lock here, or we may hit send-process currently
968                  * queueing. */
969                 spin_lock_irqsave(&dsp_lock, flags);
970                 dsp->b_active = 0;
971                 spin_unlock_irqrestore(&dsp_lock, flags);
972                 /* MUST not be locked, because it waits until queue is done. */
973                 cancel_work_sync(&dsp->workq);
974                 spin_lock_irqsave(&dsp_lock, flags);
975                 if (timer_pending(&dsp->tone.tl))
976                         del_timer(&dsp->tone.tl);
977                 skb_queue_purge(&dsp->sendq);
978                 if (dsp_debug & DEBUG_DSP_CTRL)
979                         printk(KERN_DEBUG "%s: releasing member %s\n",
980                                 __func__, dsp->name);
981                 dsp->b_active = 0;
982                 dsp_cmx_conf(dsp, 0); /* dsp_cmx_hardware will also be called
983                                          here */
984                 dsp_pipeline_destroy(&dsp->pipeline);
985
986                 if (dsp_debug & DEBUG_DSP_CTRL)
987                         printk(KERN_DEBUG "%s: remove & destroy object %s\n",
988                                 __func__, dsp->name);
989                 list_del(&dsp->list);
990                 spin_unlock_irqrestore(&dsp_lock, flags);
991
992                 if (dsp_debug & DEBUG_DSP_CTRL)
993                         printk(KERN_DEBUG "%s: dsp instance released\n",
994                                 __func__);
995                 vfree(dsp);
996                 module_put(THIS_MODULE);
997                 break;
998         }
999         return err;
1000 }
1001
1002 static void
1003 dsp_send_bh(struct work_struct *work)
1004 {
1005         struct dsp *dsp = container_of(work, struct dsp, workq);
1006         struct sk_buff *skb;
1007         struct mISDNhead        *hh;
1008
1009         if (dsp->hdlc && dsp->data_pending)
1010                 return; /* wait until data has been acknowledged */
1011
1012         /* send queued data */
1013         while ((skb = skb_dequeue(&dsp->sendq))) {
1014                 /* in locked date, we must have still data in queue */
1015                 if (dsp->data_pending) {
1016                         if (dsp_debug & DEBUG_DSP_CORE)
1017                                 printk(KERN_DEBUG "%s: fifo full %s, this is "
1018                                         "no bug!\n", __func__, dsp->name);
1019                         /* flush transparent data, if not acked */
1020                         dev_kfree_skb(skb);
1021                         continue;
1022                 }
1023                 hh = mISDN_HEAD_P(skb);
1024                 if (hh->prim == DL_DATA_REQ) {
1025                         /* send packet up */
1026                         if (dsp->up) {
1027                                 if (dsp->up->send(dsp->up, skb))
1028                                         dev_kfree_skb(skb);
1029                         } else
1030                                 dev_kfree_skb(skb);
1031                 } else {
1032                         /* send packet down */
1033                         if (dsp->ch.peer) {
1034                                 dsp->data_pending = 1;
1035                                 if (dsp->ch.recv(dsp->ch.peer, skb)) {
1036                                         dev_kfree_skb(skb);
1037                                         dsp->data_pending = 0;
1038                                 }
1039                         } else
1040                                 dev_kfree_skb(skb);
1041                 }
1042         }
1043 }
1044
1045 static int
1046 dspcreate(struct channel_req *crq)
1047 {
1048         struct dsp              *ndsp;
1049         u_long          flags;
1050
1051         if (crq->protocol != ISDN_P_B_L2DSP
1052          && crq->protocol != ISDN_P_B_L2DSPHDLC)
1053                 return -EPROTONOSUPPORT;
1054         ndsp = vmalloc(sizeof(struct dsp));
1055         if (!ndsp) {
1056                 printk(KERN_ERR "%s: vmalloc struct dsp failed\n", __func__);
1057                 return -ENOMEM;
1058         }
1059         memset(ndsp, 0, sizeof(struct dsp));
1060         if (dsp_debug & DEBUG_DSP_CTRL)
1061                 printk(KERN_DEBUG "%s: creating new dsp instance\n", __func__);
1062
1063         /* default enabled */
1064         INIT_WORK(&ndsp->workq, (void *)dsp_send_bh);
1065         skb_queue_head_init(&ndsp->sendq);
1066         ndsp->ch.send = dsp_function;
1067         ndsp->ch.ctrl = dsp_ctrl;
1068         ndsp->up = crq->ch;
1069         crq->ch = &ndsp->ch;
1070         if (crq->protocol == ISDN_P_B_L2DSP) {
1071                 crq->protocol = ISDN_P_B_RAW;
1072                 ndsp->hdlc = 0;
1073         } else {
1074                 crq->protocol = ISDN_P_B_HDLC;
1075                 ndsp->hdlc = 1;
1076         }
1077         if (!try_module_get(THIS_MODULE))
1078                 printk(KERN_WARNING "%s:cannot get module\n",
1079                         __func__);
1080
1081         sprintf(ndsp->name, "DSP_C%x(0x%p)",
1082                 ndsp->up->st->dev->id + 1, ndsp);
1083         /* set frame size to start */
1084         ndsp->features.hfc_id = -1; /* current PCM id */
1085         ndsp->features.pcm_id = -1; /* current PCM id */
1086         ndsp->pcm_slot_rx = -1; /* current CPM slot */
1087         ndsp->pcm_slot_tx = -1;
1088         ndsp->pcm_bank_rx = -1;
1089         ndsp->pcm_bank_tx = -1;
1090         ndsp->hfc_conf = -1; /* current conference number */
1091         /* set tone timer */
1092         ndsp->tone.tl.function = (void *)dsp_tone_timeout;
1093         ndsp->tone.tl.data = (long) ndsp;
1094         init_timer(&ndsp->tone.tl);
1095
1096         if (dtmfthreshold < 20 || dtmfthreshold > 500)
1097                 dtmfthreshold = 200;
1098         ndsp->dtmf.treshold = dtmfthreshold*10000;
1099
1100         /* init pipeline append to list */
1101         spin_lock_irqsave(&dsp_lock, flags);
1102         dsp_pipeline_init(&ndsp->pipeline);
1103         list_add_tail(&ndsp->list, &dsp_ilist);
1104         spin_unlock_irqrestore(&dsp_lock, flags);
1105
1106         return 0;
1107 }
1108
1109
1110 static struct Bprotocol DSP = {
1111         .Bprotocols = (1 << (ISDN_P_B_L2DSP & ISDN_P_B_MASK))
1112                 | (1 << (ISDN_P_B_L2DSPHDLC & ISDN_P_B_MASK)),
1113         .name = "dsp",
1114         .create = dspcreate
1115 };
1116
1117 static int dsp_init(void)
1118 {
1119         int err;
1120         int tics;
1121
1122         printk(KERN_INFO "DSP modul %s\n", mISDN_dsp_revision);
1123
1124         dsp_options = options;
1125         dsp_debug = debug;
1126
1127         /* set packet size */
1128         dsp_poll = poll;
1129         if (dsp_poll) {
1130                 if (dsp_poll > MAX_POLL) {
1131                         printk(KERN_ERR "%s: Wrong poll value (%d), use %d "
1132                                 "maximum.\n", __func__, poll, MAX_POLL);
1133                         err = -EINVAL;
1134                         return err;
1135                 }
1136                 if (dsp_poll < 8) {
1137                         printk(KERN_ERR "%s: Wrong poll value (%d), use 8 "
1138                                 "minimum.\n", __func__, dsp_poll);
1139                         err = -EINVAL;
1140                         return err;
1141                 }
1142                 dsp_tics = poll * HZ / 8000;
1143                 if (dsp_tics * 8000 != poll * HZ) {
1144                         printk(KERN_INFO "mISDN_dsp: Cannot clock every %d "
1145                                 "samples (0,125 ms). It is not a multiple of "
1146                                 "%d HZ.\n", poll, HZ);
1147                         err = -EINVAL;
1148                         return err;
1149                 }
1150         } else {
1151                 poll = 8;
1152                 while (poll <= MAX_POLL) {
1153                         tics = (poll * HZ) / 8000;
1154                         if (tics * 8000 == poll * HZ) {
1155                                 dsp_tics = tics;
1156                                 dsp_poll = poll;
1157                                 if (poll >= 64)
1158                                         break;
1159                         }
1160                         poll++;
1161                 }
1162         }
1163         if (dsp_poll == 0) {
1164                 printk(KERN_INFO "mISDN_dsp: There is no multiple of kernel "
1165                         "clock that equals exactly the duration of 8-256 "
1166                         "samples. (Choose kernel clock speed like 100, 250, "
1167                         "300, 1000)\n");
1168                 err = -EINVAL;
1169                 return err;
1170         }
1171         printk(KERN_INFO "mISDN_dsp: DSP clocks every %d samples. This equals "
1172                 "%d jiffies.\n", dsp_poll, dsp_tics);
1173
1174         spin_lock_init(&dsp_lock);
1175         INIT_LIST_HEAD(&dsp_ilist);
1176         INIT_LIST_HEAD(&conf_ilist);
1177
1178         /* init conversion tables */
1179         dsp_audio_generate_law_tables();
1180         dsp_silence = (dsp_options&DSP_OPT_ULAW) ? 0xff : 0x2a;
1181         dsp_audio_law_to_s32 = (dsp_options&DSP_OPT_ULAW) ?
1182                 dsp_audio_ulaw_to_s32 : dsp_audio_alaw_to_s32;
1183         dsp_audio_generate_s2law_table();
1184         dsp_audio_generate_seven();
1185         dsp_audio_generate_mix_table();
1186         if (dsp_options & DSP_OPT_ULAW)
1187                 dsp_audio_generate_ulaw_samples();
1188         dsp_audio_generate_volume_changes();
1189
1190         err = dsp_pipeline_module_init();
1191         if (err) {
1192                 printk(KERN_ERR "mISDN_dsp: Can't initialize pipeline, "
1193                         "error(%d)\n", err);
1194                 return err;
1195         }
1196
1197         err = mISDN_register_Bprotocol(&DSP);
1198         if (err) {
1199                 printk(KERN_ERR "Can't register %s error(%d)\n", DSP.name, err);
1200                 return err;
1201         }
1202
1203         /* set sample timer */
1204         dsp_spl_tl.function = (void *)dsp_cmx_send;
1205         dsp_spl_tl.data = 0;
1206         init_timer(&dsp_spl_tl);
1207         dsp_spl_tl.expires = jiffies + dsp_tics;
1208         dsp_spl_jiffies = dsp_spl_tl.expires;
1209         add_timer(&dsp_spl_tl);
1210
1211         return 0;
1212 }
1213
1214
1215 static void dsp_cleanup(void)
1216 {
1217         mISDN_unregister_Bprotocol(&DSP);
1218
1219         if (timer_pending(&dsp_spl_tl))
1220                 del_timer(&dsp_spl_tl);
1221
1222         if (!list_empty(&dsp_ilist)) {
1223                 printk(KERN_ERR "mISDN_dsp: Audio DSP object inst list not "
1224                         "empty.\n");
1225         }
1226         if (!list_empty(&conf_ilist)) {
1227                 printk(KERN_ERR "mISDN_dsp: Conference list not empty. Not "
1228                         "all memory freed.\n");
1229         }
1230
1231         dsp_pipeline_module_exit();
1232 }
1233
1234 module_init(dsp_init);
1235 module_exit(dsp_cleanup);
1236